<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    var timeString = "2033-03-23"
    var date = new Date(timeString)
    var timeStamp = date.getTime()
    console.log(timeStamp)

    var timeStamp1 = Date.parse(timeString)
    console.log(timeStamp1)
    
  </script>
</body>

</html>